1 /* $NetBSD: auth_unix.c,v 1.18 2000/07/06 03:03:30 christos Exp $ */ 2 3 /* 4 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 5 * unrestricted use provided that this legend is included on all tape 6 * media and as a part of the software program in whole or part. Users 7 * may copy or modify Sun RPC without charge, but are not authorized 8 * to license or distribute it to anyone else except as part of a product or 9 * program developed by the user. 10 * 11 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 12 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 13 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 14 * 15 * Sun RPC is provided with no support and without any obligation on the 16 * part of Sun Microsystems, Inc. to assist in its use, correction, 17 * modification or enhancement. 18 * 19 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 20 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 21 * OR ANY PART THEREOF. 22 * 23 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 24 * or profits or other special, indirect and consequential damages, even if 25 * Sun has been advised of the possibility of such damages. 26 * 27 * Sun Microsystems, Inc. 28 * 2550 Garcia Avenue 29 * Mountain View, California 94043 30 */ 31 32 #if defined(LIBC_SCCS) && !defined(lint) 33 static char *sccsid2 = "@(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro"; 34 static char *sccsid = "@(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC"; 35 #endif 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 /* 40 * auth_unix.c, Implements UNIX style authentication parameters. 41 * 42 * Copyright (C) 1984, Sun Microsystems, Inc. 43 * 44 * The system is very weak. The client uses no encryption for it's 45 * credentials and only sends null verifiers. The server sends backs 46 * null verifiers or optionally a verifier that suggests a new short hand 47 * for the credentials. 48 * 49 */ 50 51 #include "namespace.h" 52 #include "reentrant.h" 53 #include <sys/param.h> 54 55 #include <assert.h> 56 #include <err.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <unistd.h> 60 #include <string.h> 61 62 #include <rpc/types.h> 63 #include <rpc/xdr.h> 64 #include <rpc/auth.h> 65 #include <rpc/auth_unix.h> 66 #include "un-namespace.h" 67 #include "mt_misc.h" 68 69 /* auth_unix.c */ 70 static void authunix_nextverf (AUTH *); 71 static bool_t authunix_marshal (AUTH *, XDR *); 72 static bool_t authunix_validate (AUTH *, struct opaque_auth *); 73 static bool_t authunix_refresh (AUTH *, void *); 74 static void authunix_destroy (AUTH *); 75 static void marshal_new_auth (AUTH *); 76 static struct auth_ops *authunix_ops (void); 77 78 /* 79 * This struct is pointed to by the ah_private field of an auth_handle. 80 */ 81 struct audata { 82 struct opaque_auth au_origcred; /* original credentials */ 83 struct opaque_auth au_shcred; /* short hand cred */ 84 u_long au_shfaults; /* short hand cache faults */ 85 char au_marshed[MAX_AUTH_BYTES]; 86 u_int au_mpos; /* xdr pos at end of marshed */ 87 }; 88 #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) 89 90 /* 91 * Create a unix style authenticator. 92 * Returns an auth handle with the given stuff in it. 93 */ 94 AUTH * 95 authunix_create(machname, uid, gid, len, aup_gids) 96 char *machname; 97 int uid; 98 int gid; 99 int len; 100 int *aup_gids; 101 { 102 struct authunix_parms aup; 103 char mymem[MAX_AUTH_BYTES]; 104 struct timeval now; 105 XDR xdrs; 106 AUTH *auth; 107 struct audata *au; 108 109 /* 110 * Allocate and set up auth handle 111 */ 112 au = NULL; 113 auth = mem_alloc(sizeof(*auth)); 114 #ifndef _KERNEL 115 if (auth == NULL) { 116 warnx("authunix_create: out of memory"); 117 goto cleanup_authunix_create; 118 } 119 #endif 120 au = mem_alloc(sizeof(*au)); 121 #ifndef _KERNEL 122 if (au == NULL) { 123 warnx("authunix_create: out of memory"); 124 goto cleanup_authunix_create; 125 } 126 #endif 127 auth->ah_ops = authunix_ops(); 128 auth->ah_private = (caddr_t)au; 129 auth->ah_verf = au->au_shcred = _null_auth; 130 au->au_shfaults = 0; 131 au->au_origcred.oa_base = NULL; 132 133 /* 134 * fill in param struct from the given params 135 */ 136 (void)gettimeofday(&now, NULL); 137 aup.aup_time = now.tv_sec; 138 aup.aup_machname = machname; 139 aup.aup_uid = uid; 140 aup.aup_gid = gid; 141 aup.aup_len = (u_int)len; 142 aup.aup_gids = aup_gids; 143 144 /* 145 * Serialize the parameters into origcred 146 */ 147 xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); 148 if (! xdr_authunix_parms(&xdrs, &aup)) 149 abort(); 150 au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); 151 au->au_origcred.oa_flavor = AUTH_UNIX; 152 #ifdef _KERNEL 153 au->au_origcred.oa_base = mem_alloc((u_int) len); 154 #else 155 if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { 156 warnx("authunix_create: out of memory"); 157 goto cleanup_authunix_create; 158 } 159 #endif 160 memmove(au->au_origcred.oa_base, mymem, (size_t)len); 161 162 /* 163 * set auth handle to reflect new cred. 164 */ 165 auth->ah_cred = au->au_origcred; 166 marshal_new_auth(auth); 167 return (auth); 168 #ifndef _KERNEL 169 cleanup_authunix_create: 170 if (auth) 171 mem_free(auth, sizeof(*auth)); 172 if (au) { 173 if (au->au_origcred.oa_base) 174 mem_free(au->au_origcred.oa_base, (u_int)len); 175 mem_free(au, sizeof(*au)); 176 } 177 return (NULL); 178 #endif 179 } 180 181 /* 182 * Returns an auth handle with parameters determined by doing lots of 183 * syscalls. 184 */ 185 AUTH * 186 authunix_create_default() 187 { 188 AUTH *auth; 189 int ngids; 190 long ngids_max; 191 char machname[MAXHOSTNAMELEN + 1]; 192 uid_t uid; 193 gid_t gid; 194 gid_t *gids; 195 196 ngids_max = sysconf(_SC_NGROUPS_MAX) + 1; 197 gids = malloc(sizeof(gid_t) * ngids_max); 198 if (gids == NULL) 199 return (NULL); 200 201 if (gethostname(machname, sizeof machname) == -1) 202 abort(); 203 machname[sizeof(machname) - 1] = 0; 204 uid = geteuid(); 205 gid = getegid(); 206 if ((ngids = getgroups(ngids_max, gids)) < 0) 207 abort(); 208 if (ngids > NGRPS) 209 ngids = NGRPS; 210 /* XXX: interface problem; those should all have been unsigned */ 211 auth = authunix_create(machname, (int)uid, (int)gid, ngids, 212 (int *)gids); 213 free(gids); 214 return (auth); 215 } 216 217 /* 218 * authunix operations 219 */ 220 221 /* ARGSUSED */ 222 static void 223 authunix_nextverf(auth) 224 AUTH *auth; 225 { 226 /* no action necessary */ 227 } 228 229 static bool_t 230 authunix_marshal(auth, xdrs) 231 AUTH *auth; 232 XDR *xdrs; 233 { 234 struct audata *au; 235 236 assert(auth != NULL); 237 assert(xdrs != NULL); 238 239 au = AUTH_PRIVATE(auth); 240 return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); 241 } 242 243 static bool_t 244 authunix_validate(auth, verf) 245 AUTH *auth; 246 struct opaque_auth *verf; 247 { 248 struct audata *au; 249 XDR xdrs; 250 251 assert(auth != NULL); 252 assert(verf != NULL); 253 254 if (verf->oa_flavor == AUTH_SHORT) { 255 au = AUTH_PRIVATE(auth); 256 xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, 257 XDR_DECODE); 258 259 if (au->au_shcred.oa_base != NULL) { 260 mem_free(au->au_shcred.oa_base, 261 au->au_shcred.oa_length); 262 au->au_shcred.oa_base = NULL; 263 } 264 if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { 265 auth->ah_cred = au->au_shcred; 266 } else { 267 xdrs.x_op = XDR_FREE; 268 (void)xdr_opaque_auth(&xdrs, &au->au_shcred); 269 au->au_shcred.oa_base = NULL; 270 auth->ah_cred = au->au_origcred; 271 } 272 marshal_new_auth(auth); 273 } 274 return (TRUE); 275 } 276 277 static bool_t 278 authunix_refresh(AUTH *auth, void *dummy) 279 { 280 struct audata *au = AUTH_PRIVATE(auth); 281 struct authunix_parms aup; 282 struct timeval now; 283 XDR xdrs; 284 int stat; 285 286 assert(auth != NULL); 287 288 if (auth->ah_cred.oa_base == au->au_origcred.oa_base) { 289 /* there is no hope. Punt */ 290 return (FALSE); 291 } 292 au->au_shfaults ++; 293 294 /* first deserialize the creds back into a struct authunix_parms */ 295 aup.aup_machname = NULL; 296 aup.aup_gids = NULL; 297 xdrmem_create(&xdrs, au->au_origcred.oa_base, 298 au->au_origcred.oa_length, XDR_DECODE); 299 stat = xdr_authunix_parms(&xdrs, &aup); 300 if (! stat) 301 goto done; 302 303 /* update the time and serialize in place */ 304 (void)gettimeofday(&now, NULL); 305 aup.aup_time = now.tv_sec; 306 xdrs.x_op = XDR_ENCODE; 307 XDR_SETPOS(&xdrs, 0); 308 stat = xdr_authunix_parms(&xdrs, &aup); 309 if (! stat) 310 goto done; 311 auth->ah_cred = au->au_origcred; 312 marshal_new_auth(auth); 313 done: 314 /* free the struct authunix_parms created by deserializing */ 315 xdrs.x_op = XDR_FREE; 316 (void)xdr_authunix_parms(&xdrs, &aup); 317 XDR_DESTROY(&xdrs); 318 return (stat); 319 } 320 321 static void 322 authunix_destroy(auth) 323 AUTH *auth; 324 { 325 struct audata *au; 326 327 assert(auth != NULL); 328 329 au = AUTH_PRIVATE(auth); 330 mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); 331 332 if (au->au_shcred.oa_base != NULL) 333 mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); 334 335 mem_free(auth->ah_private, sizeof(struct audata)); 336 337 if (auth->ah_verf.oa_base != NULL) 338 mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); 339 340 mem_free(auth, sizeof(*auth)); 341 } 342 343 /* 344 * Marshals (pre-serializes) an auth struct. 345 * sets private data, au_marshed and au_mpos 346 */ 347 static void 348 marshal_new_auth(auth) 349 AUTH *auth; 350 { 351 XDR xdr_stream; 352 XDR *xdrs = &xdr_stream; 353 struct audata *au; 354 355 assert(auth != NULL); 356 357 au = AUTH_PRIVATE(auth); 358 xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); 359 if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || 360 (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) 361 warnx("auth_none.c - Fatal marshalling problem"); 362 else 363 au->au_mpos = XDR_GETPOS(xdrs); 364 XDR_DESTROY(xdrs); 365 } 366 367 static struct auth_ops * 368 authunix_ops() 369 { 370 static struct auth_ops ops; 371 372 /* VARIABLES PROTECTED BY ops_lock: ops */ 373 374 mutex_lock(&ops_lock); 375 if (ops.ah_nextverf == NULL) { 376 ops.ah_nextverf = authunix_nextverf; 377 ops.ah_marshal = authunix_marshal; 378 ops.ah_validate = authunix_validate; 379 ops.ah_refresh = authunix_refresh; 380 ops.ah_destroy = authunix_destroy; 381 } 382 mutex_unlock(&ops_lock); 383 return (&ops); 384 } 385